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Your post is lacking any detail. However, if you are stating that the engine starts after being cranked but dies out (wont stay running) there are 2 ways the fuel pump is activated. When the key is first turned on, there is a 5 second fuel pump run (the ECM energizes the fuel pump relay). After the engine starts, the fuel pump relay will only stay energized when the oil pressure switch closes keeping the fuel pump relay on (oil pressure is above 5-7 psi). If the oil pressure switch is faulty or there is no oil pressure, the engine will stall just after starting.
With pressure like that I would say there is nothing wrong with the pump. A 5 psi drop with the engine running would indicate that the injectors are getting a good supply of fuel. I would have the fault codes read to find a fault before I wasted money chasing something that may show up in the test.
1. Something is stopping the seal at the basket 2. The hose going to the filter housing is partially clogged or not sealed 3. If you have a 2nd filter basket before filter housing, clogged/not sealed 4. Filter is clogged and needs to be cleaned, not just dirt, but degreased 5. Leaking pressure valve if one is used
I had a large filter and regular pressure was well above 5 psi, (8 to 10psi) with everything cleaned and running, once vacuum hose was connected it jumped to 14 to 18 psi.
get a new fuel pump and screen then drop the gass tank get hi pressuer clamp releasher dis conect the battrey releave the gas pressure on the fuel rail befor you themp to remove the clamps on the gas tanks the replace the whole fuel pump and screen note replace the fuel filter allso
test fuel pressure by renting a fuel pressure test kit from schucks or auto zone then turn key on then off if it hits 50 psi it's ok if it drops below 20 psi in one minuter then fuel pump is bad. if it has throttle body injection then replace the injector or pull it apart to see if it is plugged.check oil pressuer switch behind the distributor to see if it is bad it will cause it not to run if defective.
You have a pressurized system using a pressure tank.This is a case of an air logged pressure tank. Meaning there is more air than water in the pressure tank. The pressure tank must hold 2/3 water and 1/3 air of its total volume. Installed at the tank is the air volume control to take care of this proportion. Should the air volume control malfunction or becomes defective, the air-water ratio is affected. And then, the pressure tank becomes either air logged or water logged. SOLUTION: 1. Shut the power off, and open the discharge line gate valve to flush the water in the pipe lines. 2. Open the drain plug of the pressure tank to empty all the water at the pressure tank. 3. Close the drain plug, and put the power on. 4. Start the pump, and set the flow control valve 1/4 open. 5. The pump will normally run.
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it sounds like your oil pressure sending unit may be plugged by whatever took your pressure down to 5-8 psi the first time. this is extremely low pressure as i am sure you know but at 30 psi your light should go off i would replace the sending unit if your oil pressure is holding 30